1
稍微有点背景，我正在使用RedBear Blend微控制器尝试通过BLE向Android应用程序发送数据，以便使用某些开源血糖仪硬件并尝试使用某个大学项目将其变成一个“智能”设备，并配有一个配套应用程序来记录数据。Android BLE未正确连接到设备
使用示例RedBear聊天应用程序可以在这里时，这工作得很好：当我试图端口的功能集成到我的应用程序，它看起来为
5-01 12:39:26.316 2753-2753/com.redbear.chat W/System: ClassLoader referenced unknown path: /data/app/com.redbear.chat-1/lib/arm
05-01 12:39:26.406 2753-2753/com.redbear.chat D/SecWifiDisplayUtil: Metadata value : none
05-01 12:39:26.406 2753-2753/com.redbear.chat D/ViewRootImpl: #1 mView = com.android.internal.policy.PhoneWindow$DecorView{6a1bff8 I.E...... R.....ID 0,0-0,0}
05-01 12:39:26.406 2753-2861/com.redbear.chat D/OpenGLRenderer: Use EGL_SWAP_BEHAVIOR_PRESERVED: true
05-01 12:39:26.456 2753-2861/com.redbear.chat I/Adreno: QUALCOMM build : d842ad3, Ia10634f51b
Build Date : 01/04/16
OpenGL ES Shader Compiler Version: XE031.06.00.05
Local Branch : mybranch17578993
Remote Branch : quic/LA.BF.2.1.2_rb1.7
Remote Branch : NONE
Reconstruct Branch : NOTHING
05-01 12:39:26.456 2753-2861/com.redbear.chat D/libEGL: eglInitialize EGLDisplay = 0xae1e87c4
05-01 12:39:26.456 2753-2861/com.redbear.chat I/OpenGLRenderer: Initialized EGL, version 1.4
05-01 12:39:26.486 2753-2753/com.redbear.chat D/BluetoothGatt: connect() - device: F0:44:62:58:BB:ED, auto: false
05-01 12:39:26.486 2753-2753/com.redbear.chat D/BluetoothGatt: registerApp()
05-01 12:39:26.486 2753-2753/com.redbear.chat D/BluetoothGatt: registerApp() - UUID=345487dc-e3ef-4a26-866c-b504f43c14c3
05-01 12:39:26.526 2753-2753/com.redbear.chat D/RBLService: Trying to create a new connection.
05-01 12:39:26.526 2753-2769/com.redbear.chat D/BluetoothGatt: onClientRegistered() - status=0 clientIf=5
05-01 12:39:26.536 2753-2753/com.redbear.chat W/DisplayListCanvas: DisplayListCanvas is started on unbinded RenderNode (without mOwningView)
05-01 12:39:26.536 2753-2753/com.redbear.chat W/DisplayListCanvas: DisplayListCanvas is started on unbinded RenderNode (without mOwningView)
05-01 12:39:26.546 2753-2861/com.redbear.chat D/libGLESv1: DTS_GLAPI : DTS is not allowed for Package : com.redbear.chat
05-01 12:39:26.576 2753-2861/com.redbear.chat V/RenderScript: 0x9e09e000 Launching thread(s), CPUs 4
05-01 12:39:26.586 2753-2753/com.redbear.chat D/ViewRootImpl: MSG_RESIZED_REPORT: ci=Rect(0, 96 - 0, 0) vi=Rect(0, 96 - 0, 0) or=1
05-01 12:39:26.606 2753-2753/com.redbear.chat I/Timeline: Timeline: Activity_idle id: [email protected] time:49435618
05-01 12:39:26.726 2753-2753/com.redbear.chat D/ViewRootImpl: MSG_RESIZED: ci=Rect(0, 96 - 0, 996) vi=Rect(0, 96 - 0, 996) or=1
05-01 12:39:28.976 2753-2809/com.redbear.chat D/BluetoothGatt: onClientConnectionState() - status=0 clientIf=5 device=F0:44:62:58:BB:ED
05-01 12:39:28.986 2753-2809/com.redbear.chat I/RBLService: Connected to GATT server.
05-01 12:39:28.996 2753-2809/com.redbear.chat D/BluetoothGatt: discoverServices() - device: F0:44:62:58:BB:ED
05-01 12:39:28.996 2753-2809/com.redbear.chat I/RBLService: Attempting to start service discovery:true
05-01 12:39:29.276 2753-2768/com.redbear.chat D/BluetoothGatt: onClientConnParamsChanged() - Device=F0:44:62:58:BB:ED interval=6 status=0
05-01 12:39:29.536 2753-2768/com.redbear.chat D/BluetoothGatt: onSearchComplete() = Device=F0:44:62:58:BB:ED Status=0
05-01 12:39:29.536 2753-2753/com.redbear.chat D/BluetoothGatt: setCharacteristicNotification() - uuid: 713d0002-503e-4c75-ba94-3148f18d941e enable: true
05-01 12:39:29.566 2753-2809/com.redbear.chat D/BluetoothGatt: onClientConnParamsChanged() - Device=F0:44:62:58:BB:ED interval=39 status=0
05-01 12:39:34.846 2753-2769/com.redbear.chat D/BluetoothGatt: onClientConnParamsChanged() - Device=F0:44:62:58:BB:ED interval=18 status=0
05-01 12:40:25.866 2753-2753/com.redbear.chat V/ActivityThread: updateVisibility : ActivityRecord{f85a5ca [email protected] {com.redbear.chat/com.redbear.chat.Chat}} show : true
05-01 12:40:31.266 2753-2753/com.redbear.chat D/ViewRootImpl: MSG_RESIZED_REPORT: ci=Rect(0, 96 - 0, 1092) vi=Rect(0, 96 - 0, 1092) or=1
05-01 12:40:31.296 2753-2753/com.redbear.chat D/ViewRootImpl: MSG_RESIZED_REPORT: ci=Rect(0, 96 - 0, 0) vi=Rect(0, 96 - 0, 0) or=1
不过：从示例应用程序https://github.com/RedBearLab/Android/tree/master/Examples/Chat
logcat的虽然它们没有正确连接，因为我没有得到相同的输出到logcat，相反，应用程序崩溃时出现空指针异常，因为连接没有正确初始化。所以我不确定我做错了什么，为了让设备成功连接。
我试图端口从例子中的功能集成到我的应用程序在下列文件：
MainActivity.java
Device.java
StoreReading.java
TakeReading.java
的应用程序是在我的github上。 https://github.com/rowmanns/android_ble/tree/master/BloodGlucoseV3
05-01 13:03:57.606 25495-25495/com.fyp.rowan.bloodglucosev3 D/ViewRootImpl: #1 mView = com.android.internal.policy.PhoneWindow$DecorView{1186991 I.E...... R.....ID 0,0-0,0}
05-01 13:03:57.616 25495-25645/com.fyp.rowan.bloodglucosev3 D/OpenGLRenderer: Use EGL_SWAP_BEHAVIOR_PRESERVED: true
05-01 13:03:57.646 25495-25645/com.fyp.rowan.bloodglucosev3 I/Adreno: QUALCOMM build : d842ad3, Ia10634f51b
Build Date : 01/04/16
OpenGL ES Shader Compiler Version: XE031.06.00.05
Local Branch : mybranch17578993
Remote Branch : quic/LA.BF.2.1.2_rb1.7
Remote Branch : NONE
Reconstruct Branch : NOTHING
05-01 13:03:57.646 25495-25645/com.fyp.rowan.bloodglucosev3 D/libEGL: eglInitialize EGLDisplay = 0x9f7ff7c4
05-01 13:03:57.646 25495-25645/com.fyp.rowan.bloodglucosev3 I/OpenGLRenderer: Initialized EGL, version 1.4
05-01 13:03:57.676 25495-25495/com.fyp.rowan.bloodglucosev3 D/ViewRootImpl: MSG_RESIZED_REPORT: ci=Rect(0, 96 - 0, 0) vi=Rect(0, 96 - 0, 0) or=1
05-01 13:03:57.686 25495-25495/com.fyp.rowan.bloodglucosev3 W/DisplayListCanvas: DisplayListCanvas is started on unbinded RenderNode (without mOwningView)
05-01 13:03:57.686 25495-25645/com.fyp.rowan.bloodglucosev3 D/libGLESv1: DTS_GLAPI : DTS is not allowed for Package : com.fyp.rowan.bloodglucosev3
05-01 13:03:57.716 25495-25495/com.fyp.rowan.bloodglucosev3 I/Timeline: Timeline: Activity_idle id: [email protected] time:50906726
05-01 13:04:00.116 25495-25495/com.fyp.rowan.bloodglucosev3 D/ViewRootImpl: ViewPostImeInputStage processPointer 0
05-01 13:04:00.206 25495-25495/com.fyp.rowan.bloodglucosev3 D/ViewRootImpl: ViewPostImeInputStage processPointer 1
05-01 13:04:00.216 25495-25495/com.fyp.rowan.bloodglucosev3 I/Timeline: Timeline: Activity_launch_request id:com.fyp.rowan.bloodglucosev3 time:50909220
05-01 13:04:00.266 25495-25495/com.fyp.rowan.bloodglucosev3 I/ToolbarWidgetWrapper: Progress display unsupported
05-01 13:04:00.286 25495-25731/com.fyp.rowan.bloodglucosev3 D/BluetoothAdapter: startLeScan(): null
05-01 13:04:00.286 25495-25731/com.fyp.rowan.bloodglucosev3 D/BluetoothAdapter: STATE_ON
05-01 13:04:00.286 25495-25731/com.fyp.rowan.bloodglucosev3 D/BluetoothAdapter: STATE_ON
05-01 13:04:00.286 25495-25731/com.fyp.rowan.bloodglucosev3 D/BluetoothLeScanner: Start Scan
05-01 13:04:00.286 25495-25731/com.fyp.rowan.bloodglucosev3 D/BluetoothAdapter: STATE_ON
05-01 13:04:00.296 25495-25731/com.fyp.rowan.bloodglucosev3 D/BluetoothAdapter: STATE_ON
05-01 13:04:00.296 25495-25731/com.fyp.rowan.bloodglucosev3 D/BluetoothAdapter: STATE_ON
05-01 13:04:00.296 25495-25731/com.fyp.rowan.bloodglucosev3 D/BluetoothAdapter: STATE_ON
05-01 13:04:00.306 25495-25495/com.fyp.rowan.bloodglucosev3 D/SecWifiDisplayUtil: Metadata value : none
05-01 13:04:00.316 25495-25495/com.fyp.rowan.bloodglucosev3 D/ViewRootImpl: #1 mView = com.android.internal.policy.PhoneWindow$DecorView{948186d V.E...... R.....I. 0,0-0,0}
05-01 13:04:00.326 25495-25495/com.fyp.rowan.bloodglucosev3 D/ViewRootImpl: #1 mView = com.android.internal.policy.PhoneWindow$DecorView{358dc4c I.E...... R.....ID 0,0-0,0}
05-01 13:04:00.336 25495-25583/com.fyp.rowan.bloodglucosev3 D/BluetoothLeScanner: onClientRegistered() - status=0 clientIf=5
05-01 13:04:00.406 25495-25495/com.fyp.rowan.bloodglucosev3 D/ViewRootImpl: MSG_RESIZED_REPORT: ci=Rect(0, 0 - 0, 0) vi=Rect(0, 0 - 0, 0) or=1
05-01 13:04:00.406 25495-25495/com.fyp.rowan.bloodglucosev3 W/DisplayListCanvas: DisplayListCanvas is started on unbinded RenderNode (without mOwningView)
05-01 13:04:00.426 25495-25506/com.fyp.rowan.bloodglucosev3 D/ScanRecord: parseFromBytes
05-01 13:04:00.426 25495-25495/com.fyp.rowan.bloodglucosev3 W/DisplayListCanvas: DisplayListCanvas is started on unbinded RenderNode (without mOwningView)
05-01 13:04:00.436 25495-25495/com.fyp.rowan.bloodglucosev3 D/ViewRootImpl: MSG_RESIZED_REPORT: ci=Rect(0, 96 - 0, 0) vi=Rect(0, 96 - 0, 0) or=1
05-01 13:04:00.466 25495-25645/com.fyp.rowan.bloodglucosev3 D/OpenGLRenderer: endAllActiveAnimators on 0xb2b49680 (RippleDrawable) with handle 0xa91ee510
05-01 13:04:00.466 25495-25507/com.fyp.rowan.bloodglucosev3 D/ScanRecord: parseFromBytes
05-01 13:04:00.476 25495-25495/com.fyp.rowan.bloodglucosev3 I/Timeline: Timeline: Activity_idle id: [email protected] time:50909481
05-01 13:04:00.526 25495-25588/com.fyp.rowan.bloodglucosev3 D/ScanRecord: parseFromBytes
05-01 13:04:00.576 25495-25583/com.fyp.rowan.bloodglucosev3 D/ScanRecord: parseFromBytes
05-01 13:04:00.626 25495-25506/com.fyp.rowan.bloodglucosev3 D/ScanRecord: parseFromBytes
05-01 13:04:00.686 25495-25507/com.fyp.rowan.bloodglucosev3 D/ScanRecord: parseFromBytes
05-01 13:04:00.726 25495-25495/com.fyp.rowan.bloodglucosev3 V/ActivityThread: updateVisibility : ActivityRecord{c3a515a [email protected] {com.fyp.rowan.bloodglucosev3/com.fyp.rowan.bloodglucosev3.MainActivity}} show : false
05-01 13:04:00.746 25495-25507/com.fyp.rowan.bloodglucosev3 D/ScanRecord: parseFromBytes
05-01 13:04:00.846 25495-25507/com.fyp.rowan.bloodglucosev3 D/ScanRecord: parseFromBytes
05-01 13:04:00.896 25495-25507/com.fyp.rowan.bloodglucosev3 D/ScanRecord: parseFromBytes
05-01 13:04:00.956 25495-25506/com.fyp.rowan.bloodglucosev3 D/ScanRecord: parseFromBytes
05-01 13:04:01.016 25495-25506/com.fyp.rowan.bloodglucosev3 D/ScanRecord: parseFromBytes
05-01 13:04:01.076 25495-25588/com.fyp.rowan.bloodglucosev3 D/ScanRecord: parseFromBytes
05-01 13:04:01.136 25495-25583/com.fyp.rowan.bloodglucosev3 D/ScanRecord: parseFromBytes
05-01 13:04:01.196 25495-25583/com.fyp.rowan.bloodglucosev3 D/ScanRecord: parseFromBytes
05-01 13:04:01.276 25495-25583/com.fyp.rowan.bloodglucosev3 D/ScanRecord: parseFromBytes
05-01 13:04:01.326 25495-25506/com.fyp.rowan.bloodglucosev3 D/ScanRecord: parseFromBytes
05-01 13:04:01.366 25495-25507/com.fyp.rowan.bloodglucosev3 D/ScanRecord: parseFromBytes
05-01 13:04:01.416 25495-25507/com.fyp.rowan.bloodglucosev3 D/ScanRecord: parseFromBytes
05-01 13:04:01.476 25495-25588/com.fyp.rowan.bloodglucosev3 D/ScanRecord: parseFromBytes
05-01 13:04:01.536 25495-25588/com.fyp.rowan.bloodglucosev3 D/ScanRecord: parseFromBytes
05-01 13:04:01.586 25495-25506/com.fyp.rowan.bloodglucosev3 D/ScanRecord: parseFromBytes
05-01 13:04:01.646 25495-25506/com.fyp.rowan.bloodglucosev3 D/ScanRecord: parseFromBytes
05-01 13:04:01.696 25495-25506/com.fyp.rowan.bloodglucosev3 D/ScanRecord: parseFromBytes
05-01 13:04:01.746 25495-25506/com.fyp.rowan.bloodglucosev3 D/ScanRecord: parseFromBytes
05-01 13:04:01.806 25495-25506/com.fyp.rowan.bloodglucosev3 D/ScanRecord: parseFromBytes
05-01 13:04:01.866 25495-25588/com.fyp.rowan.bloodglucosev3 D/ScanRecord: parseFromBytes
05-01 13:04:01.926 25495-25588/com.fyp.rowan.bloodglucosev3 D/ScanRecord: parseFromBytes
05-01 13:04:01.966 25495-25588/com.fyp.rowan.bloodglucosev3 D/ScanRecord: parseFromBytes
05-01 13:04:02.026 25495-25506/com.fyp.rowan.bloodglucosev3 D/ScanRecord: parseFromBytes
05-01 13:04:02.146 25495-25506/com.fyp.rowan.bloodglucosev3 D/ScanRecord: parseFromBytes
05-01 13:04:02.206 25495-25506/com.fyp.rowan.bloodglucosev3 D/ScanRecord: parseFromBytes
05-01 13:04:02.266 25495-25583/com.fyp.rowan.bloodglucosev3 D/ScanRecord: parseFromBytes
05-01 13:04:02.316 25495-25583/com.fyp.rowan.bloodglucosev3 D/ScanRecord: parseFromBytes
05-01 13:04:02.376 25495-25588/com.fyp.rowan.bloodglucosev3 D/ScanRecord: parseFromBytes
05-01 13:04:02.436 25495-25507/com.fyp.rowan.bloodglucosev3 D/ScanRecord: parseFromBytes
05-01 13:04:02.486 25495-25507/com.fyp.rowan.bloodglucosev3 D/ScanRecord: parseFromBytes
05-01 13:04:02.546 25495-25507/com.fyp.rowan.bloodglucosev3 D/ScanRecord: parseFromBytes
05-01 13:04:02.606 25495-25506/com.fyp.rowan.bloodglucosev3 D/ScanRecord: parseFromBytes
05-01 13:04:02.646 25495-25506/com.fyp.rowan.bloodglucosev3 D/ScanRecord: parseFromBytes
05-01 13:04:02.696 25495-25506/com.fyp.rowan.bloodglucosev3 D/ScanRecord: parseFromBytes
05-01 13:04:02.756 25495-25507/com.fyp.rowan.bloodglucosev3 D/ScanRecord: parseFromBytes
05-01 13:04:02.816 25495-25583/com.fyp.rowan.bloodglucosev3 D/ScanRecord: parseFromBytes
05-01 13:04:02.876 25495-25506/com.fyp.rowan.bloodglucosev3 D/ScanRecord: parseFromBytes
05-01 13:04:02.926 25495-25506/com.fyp.rowan.bloodglucosev3 D/ScanRecord: parseFromBytes
05-01 13:04:02.986 25495-25506/com.fyp.rowan.bloodglucosev3 D/ScanRecord: parseFromBytes
05-01 13:04:03.046 25495-25583/com.fyp.rowan.bloodglucosev3 D/ScanRecord: parseFromBytes
05-01 13:04:03.106 25495-25583/com.fyp.rowan.bloodglucosev3 D/ScanRecord: parseFromBytes
05-01 13:04:03.166 25495-25507/com.fyp.rowan.bloodglucosev3 D/ScanRecord: parseFromBytes
05-01 13:04:03.216 25495-25507/com.fyp.rowan.bloodglucosev3 D/ScanRecord: parseFromBytes
05-01 13:04:03.286 25495-25506/com.fyp.rowan.bloodglucosev3 D/ScanRecord: parseFromBytes
05-01 13:04:03.326 25495-25733/com.fyp.rowan.bloodglucosev3 I/Timeline: Timeline: Activity_launch_request id:com.fyp.rowan.bloodglucosev3 time:50912335
05-01 13:04:03.336 25495-25583/com.fyp.rowan.bloodglucosev3 D/ScanRecord: parseFromBytes
05-01 13:04:03.346 25495-25731/com.fyp.rowan.bloodglucosev3 D/BluetoothAdapter: stopLeScan()
05-01 13:04:03.346 25495-25731/com.fyp.rowan.bloodglucosev3 D/BluetoothAdapter: STATE_ON
05-01 13:04:03.346 25495-25731/com.fyp.rowan.bloodglucosev3 D/BluetoothAdapter: STATE_ON
05-01 13:04:03.346 25495-25731/com.fyp.rowan.bloodglucosev3 D/BluetoothAdapter: STATE_ON
05-01 13:04:03.356 25495-25731/com.fyp.rowan.bloodglucosev3 D/BluetoothAdapter: STATE_ON
05-01 13:04:03.356 25495-25731/com.fyp.rowan.bloodglucosev3 D/BluetoothLeScanner: Stop Scan
05-01 13:04:03.396 25495-25495/com.fyp.rowan.bloodglucosev3 D/ViewRootImpl: #3 mView = null
05-01 13:04:03.406 25495-25495/com.fyp.rowan.bloodglucosev3 E/ViewRootImpl: sendUserActionEvent() mView == null
05-01 13:04:03.426 25495-25495/com.fyp.rowan.bloodglucosev3 D/AbsListView: Get MotionRecognitionManager
05-01 13:04:03.426 25495-25495/com.fyp.rowan.bloodglucosev3 E/MotionRecognitionManager: mSContextService = [email protected]
05-01 13:04:03.436 25495-25495/com.fyp.rowan.bloodglucosev3 E/MotionRecognitionManager: motionService = [email protected]393d4f
05-01 13:04:03.436 25495-25495/com.fyp.rowan.bloodglucosev3 E/MotionRecognitionManager: motionService = [email protected]393d4f
05-01 13:04:03.436 25495-25495/com.fyp.rowan.bloodglucosev3 D/SecWifiDisplayUtil: Metadata value : none
05-01 13:04:03.436 25495-25495/com.fyp.rowan.bloodglucosev3 D/ViewRootImpl: #1 mView = com.android.internal.policy.PhoneWindow$DecorView{1765f6b I.E...... R.....ID 0,0-0,0}
05-01 13:04:03.486 25495-25495/com.fyp.rowan.bloodglucosev3 W/DisplayListCanvas: DisplayListCanvas is started on unbinded RenderNode (without mOwningView)
05-01 13:04:03.496 25495-25495/com.fyp.rowan.bloodglucosev3 D/ViewRootImpl: MSG_RESIZED_REPORT: ci=Rect(0, 96 - 0, 0) vi=Rect(0, 96 - 0, 0) or=1
05-01 13:04:03.536 25495-25495/com.fyp.rowan.bloodglucosev3 I/Timeline: Timeline: Activity_idle id: [email protected] time:50912545
05-01 13:04:03.756 25495-25495/com.fyp.rowan.bloodglucosev3 V/ActivityThread: updateVisibility : ActivityRecord{fbc0c5e [email protected] {com.fyp.rowan.bloodglucosev3/com.fyp.rowan.bloodglucosev3.TakeReading}} show : false
05-01 13:04:04.976 25495-25495/com.fyp.rowan.bloodglucosev3 D/ViewRootImpl: ViewPostImeInputStage processPointer 0
05-01 13:04:05.076 25495-25495/com.fyp.rowan.bloodglucosev3 D/ViewRootImpl: ViewPostImeInputStage processPointer 1
05-01 13:04:05.156 25495-25495/com.fyp.rowan.bloodglucosev3 I/Timeline: Timeline: Activity_launch_request id:com.fyp.rowan.bloodglucosev3 time:50914163
05-01 13:04:05.236 25495-25495/com.fyp.rowan.bloodglucosev3 D/SecWifiDisplayUtil: Metadata value : none
05-01 13:04:05.236 25495-25495/com.fyp.rowan.bloodglucosev3 D/ViewRootImpl: #1 mView = com.android.internal.policy.PhoneWindow$DecorView{5f5d546 I.E...... R.....ID 0,0-0,0}
05-01 13:04:05.296 25495-25495/com.fyp.rowan.bloodglucosev3 W/DisplayListCanvas: DisplayListCanvas is started on unbinded RenderNode (without mOwningView)
05-01 13:04:05.296 25495-25495/com.fyp.rowan.bloodglucosev3 W/DisplayListCanvas: DisplayListCanvas is started on unbinded RenderNode (without mOwningView)
05-01 13:04:05.316 25495-25495/com.fyp.rowan.bloodglucosev3 D/ViewRootImpl: MSG_RESIZED_REPORT: ci=Rect(0, 96 - 0, 0) vi=Rect(0, 96 - 0, 0) or=1
05-01 13:04:05.336 25495-25495/com.fyp.rowan.bloodglucosev3 W/DisplayListCanvas: DisplayListCanvas is started on unbinded RenderNode (without mOwningView)
05-01 13:04:05.356 25495-25645/com.fyp.rowan.bloodglucosev3 D/OpenGLRenderer: endAllActiveAnimators on 0x9b0cc680 (ListView) with handle 0x9d855ee0
05-01 13:04:05.356 25495-25495/com.fyp.rowan.bloodglucosev3 I/Timeline: Timeline: Activity_idle id: [email protected] time:50914367
05-01 13:04:05.496 25495-25495/com.fyp.rowan.bloodglucosev3 D/ViewRootImpl: MSG_RESIZED: ci=Rect(0, 96 - 0, 996) vi=Rect(0, 96 - 0, 996) or=1
05-01 13:04:05.586 25495-25495/com.fyp.rowan.bloodglucosev3 W/DisplayListCanvas: DisplayListCanvas is started on unbinded RenderNode (without mOwningView)
05-01 13:04:05.606 25495-25495/com.fyp.rowan.bloodglucosev3 D/ViewRootImpl: #3 mView = null
05-01 13:04:16.176 25495-25495/com.fyp.rowan.bloodglucosev3 D/AndroidRuntime: Shutting down VM
05-01 13:04:16.186 25495-25495/com.fyp.rowan.bloodglucosev3 E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.fyp.rowan.bloodglucosev3, PID: 25495
java.lang.RuntimeException: Unable to destroy activity {com.fyp.rowan.bloodglucosev3/com.fyp.rowan.bloodglucosev3.StoreReading}: java.lang.NullPointerException: Attempt to invoke virtual method 'void com.fyp.rowan.bloodglucosev3.RBLService.disconnect()' on a null object reference
at android.app.ActivityThread.performDestroyActivity(ActivityThread.java:5062)
at android.app.ActivityThread.handleDestroyActivity(ActivityThread.java:5085)
at android.app.ActivityThread.handleRelaunchActivity(ActivityThread.java:5348)
at android.app.ActivityThread.access$1200(ActivityThread.java:221)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1800)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:158)
at android.app.ActivityThread.main(ActivityThread.java:7225)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1230)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1120)
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void com.fyp.rowan.bloodglucosev3.RBLService.disconnect()' on a null object reference
at com.fyp.rowan.bloodglucosev3.StoreReading.onDestroy(StoreReading.java:155)
at android.app.Activity.performDestroy(Activity.java:7102)
at android.app.Instrumentation.callActivityOnDestroy(Instrumentation.java:1170)
at android.app.ActivityThread.performDestroyActivity(ActivityThread.java:5040)
at android.app.ActivityThread.handleDestroyActivity(ActivityThread.java:5085)
at android.app.ActivityThread.handleRelaunchActivity(ActivityThread.java:5348)
at android.app.ActivityThread.access$1200(ActivityThread.java:221)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1800)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:158)
at android.app.ActivityThread.main(ActivityThread.java:7225)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1230)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1120)
任何帮助/想法将不胜感激！
你得到一个空指针异常。您应该确保您不会对可能为空的对象调用方法。在你的代码中，只有服务绑定成功时，变量才会被设置为一个对象。解除绑定时，它将被设置为空。 – Emil
当然，谢谢我的理解。然而，我不确定为什么这些设备不是首先连接的。就我所知，我正在以与示例相同的方式进行操作。 – rowmanns